[cisco-voip] cptone command behavior on certain model routers/hardware

[Erick Bergquist]

Update on this... 

Played around with downloading tones from call
manager, this way they are custom tones, and when
manually entering 'cptone C1' on voice port it does
not override the impedance setting.  

But when this is pushed from CCM, CCM config-download
first issues a 'cptone us' command then a few seconds
later does a 'cptone Custom1' command so the impedance
still gets wiped. So much for that idea of getting
around this...

--- Erick Bergquist <erickbe at yahoo.com> wrote:

> Hi,
> 
> I have a situation where the impedance command is
> being removed off voice-port configuration when the
> MGCP cfg changes and the gateway MGCP config is
> updated. 
> 
> This doesn't effect all gateways/routers though, and
> appears to effect the ISR models (2800/3800) and XM
> series gateways. This is not happening on 1760, 3700
> series, 2620, etc. 
> 
> MGCP pushes down cptone command (locale on call
> manager side) and on the ISRs and XM, when 'cptone
> us'
> is entered it also changes impedance to 600real.
> Just
> on some routers though, not all. The problem is I
> have
> client who has analog lines where 600Real is not the
> best match and cause voice quality issues, and the
> best match/sounding impedance is complex1. 
> 
> Now, I can remove the ccm-manager config command as
> a
> workaround, but that also means the call manager
> isn't
> in full control of the gateway which could be a
> problem at times. We could also change the locale on
> the call manager side GW config to one where cptone
> sets impedance to complex1 but that causes other
> problems with the way the line works and tones
> heard. 
> 
> Does anyone know if cptone command is suppose to
> change impedance on some model hardware, or not?
> I've
> been looking all over cisco and not able to find
> anything yet. 
> 
> Output from a 2610XM or 2801:
> 
> router(config-voiceport)#cptone US
> %Impedance also changed to 600Real
> 
> On 3700 series, 1760:
> 
> router(config-voiceport)#impedance complex2
> router(config-voiceport)#cptone NO
> router(config-voiceport)#Cptone VE
> router(config-voiceport)#do show run | inc imped
>  impedance complex2
> router(config-voiceport)#cptone US
> router(config-voiceport)#no impeda
> 
> If I do this on router only, with no changes made on
> CCM side, it will download new MGCP config and wipe
> out the impedance commands on effected
> models/hardware
> only.
> 
> ccm-manager config-download reset-xml-version
> ccm-manager config-download check-config reset (or
> restart)
> 
> If I just do a ccm-manager config-download
> check-config reset without making changes or
> clearing
> XML version, the commands do not get removed. Only
> when there is a difference. I think also on reboot
> but
> have not verified that yet.
> 
> 
> 
> 		
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